Relevance of the fluorescence radiation in VHE gamma-ray observations with the Cherenkov technique

Morcuende, D.; Rosado, J.; Contreras, J. L.; Arqueros, F.

doi:10.1016/j.astropartphys.2018.11.003

Cited by 3 publications

(6 citation statements)

References 26 publications

(53 reference statements)

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“…We previously used our implementation of the fluorescence emission in CORSIKA to evaluate in a systematic way the relevance of the fluorescence radiation in Cherenkov telescopes [5]. This light contribution becomes important at large distances from the shower core impact point, because the Cherenkov light density decreases dramatically while that of the fluorescence light keeps rather constant due to its isotropic emission, as shown in Fig.…”

Section: First Results and On-going Workmentioning

confidence: 99%

“…We have implemented the fluorescence emission within the CORSIKA framework. The code is thoroughly described in [5]. It essentially generates fluorescence photons along the track of every simulated charged particle as well as at any point where a particle falls below the simulation cut-off.…”

Section: Methodsmentioning

confidence: 99%

“…The values were averaged over 6000 vertical showers initiated by 100-TeV gamma rays. For comparison, the fluorescence contamination previously estimated in[5] solely from CORSIKA simulations (considering 10 • FoV telescopes) is plotted in red.…”

mentioning

confidence: 99%

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Simulation of fluorescence radiation for Cherenkov observatories

Morcuende¹,

Rosado²,

Contreras³

et al. 2019

Proceedings of the New Era of Multi-Messenger Astrophysics — PoS(Asterics2019)

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Several techniques inside Astroparticle Physics use Extensive Air Showers (EAS) as a proxy to study very energetic particles that reach Earth. EAS themselves are detected through different means, among them the measurement of Cherenkov or fluorescence radiation produced in them. A detailed simulation of EAS is mandatory to develop, test and use these techniques. In this respect the most popular simulation program is the CORSIKA code. This code includes the Cherenkov emission but not the fluorescence one. In a previous work, we introduced the fluorescence emission in CORSIKA and showed first quantitative results on the fluorescence contamination in Cherenkov telescopes, either imaging or non-imaging ones. In this paper, we report on progress made in this work and discuss possible future applications in several currently operating Cherenkov observatories as well as in the design of future innovative Astroparticle Physics observatories.

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Section: First Results and On-going Workmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Simulation of fluorescence radiation for Cherenkov observatories

Morcuende¹,

Rosado²,

Contreras³

et al. 2019

Proceedings of the New Era of Multi-Messenger Astrophysics — PoS(Asterics2019)

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show abstract

“…CORSIKA (see appendix A.1), have become essential in order to optimize IACTs and reconstruction methods. Although CORSIKA is not able to simulate fluorescence light, there has been work done by the community to implement fluorescence emission in CORSIKA ( [5,6]). A general downside of these Monte Carlo simulations is the increased computation time with higher primary particle energies (and to an lesser extend increased storage size).…”

Section: Jinst 18 P08018mentioning

confidence: 99%

EASpy: fast simulation of fluorescence and Cherenkov light from extended air showers at large zenith angles

Baktash,

Horns

2023

J. Inst.

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The detailed simulation of extended air showers (EAS) and their emission of Cherenkov and fluorescence light requires increasing computation time and storage volume with increasing energy of the primary particle. Given these limitations, it is currently challenging to optimize configurations of imaging air Cherenkov telescopes at photon energies beyond approximately 100 TeV. Additionally, the existing simulation frameworks are not capable of capturing the interplay of Cherenkov and fluorescence light emission at large zenith angle distances (≳ 70°), where the collection area of Cherenkov telescopes considerably increases. Here, we present EASpy, a framework for the simulation of EAS at large zenith angles using parametrizations for electron-positron distributions. Our proposed approach for the emission of fluorescence and Cherenkov light and the subsequent imaging of these components by Imaging Atmospheric Cherenkov Telescopes (IACTs) aims to provide flexibility and accuracy while at the same time it reduces the computation time considerably compared to full Monte Carlo simulations. We find excellent agreement of the resulting Cherenkov images when comparing results obtained from EASpy with the de-facto standard simulation tool CORSIKA and sim_telarray. In the process of verifying our approach, we have found that air shower images appear wider and longer with increasing impact distance at large zenith angles, an effect that has previously not been noted. We also investigate the distribution of light on the ground for fluorescence and Cherenkov emission and highlight their key differences to distributions at moderate zenith angles.

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“…Different flat atmospheric models are available. The code uses detailed parameterizations of both fluorescence and Cherenkov light emission and angular distribution (Morcuende et al 2019;Nerling et al 2006). The time-varying light intensity reaching a telescope is readily computed from geometry.…”

Section: Introductionmentioning

confidence: 99%

ShowerModel: A Python package for modelling cosmic-rayshowers, their light production and their detection

Morcuende,

Rosado

2021

Preprint

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Cosmic-ray observatories necessarily rely on Monte Carlo simulations for their design, calibration and analysis of their data. Detailed simulations are very demanding computationally. We present a python-based package called ShowerModel to model cosmic-ray showers, their light production and their detection by an array of telescopes. It is based on parameterizations of both Cherenkov and fluorescence emission in cosmic-ray induced air showers. The package permits the modelling of fluorescence telescopes, imaging air Cherenkov telescopes, wide-angle Cherenkov detectors or any hybrid design.ShowerModel was conceived as a tool to speed up calculations that do not require a full simulation or that may serve to complement complex Monte Carlo studies and data analyses (e.g., as a cross-check). It can also be used for educational purposes.

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Relevance of the fluorescence radiation in VHE gamma-ray observations with the Cherenkov technique

Cited by 3 publications

References 26 publications

Simulation of fluorescence radiation for Cherenkov observatories

Simulation of fluorescence radiation for Cherenkov observatories

EASpy: fast simulation of fluorescence and Cherenkov light from extended air showers at large zenith angles

ShowerModel: A Python package for modelling cosmic-rayshowers, their light production and their detection

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